For a shoe brake, the equivalent coefficient of friction is equal to (where `mu` = Actual coefficient of friction, and `theta` = Semi-block angle) Options: A . &nbsp`(2 mu sin theta)/(theta + sin theta)` B . &nbsp`( mu sin theta)/(2theta + sin2 theta)` C . &nbsp`(4 mu sin theta)/(theta + sin theta)` D . &nbsp`(4 mu sin theta)/(2theta + sin2 theta)`

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Question

For a shoe
brake, the equivalent coefficient of friction is equal to (where `mu` =
Actual coefficient of friction, and `theta` = Semi-block angle)

Options:

A . `(2 mu sin theta)/(theta + sin theta)`

B . `( mu sin theta)/(2theta + sin2 theta)`

C . `(4 mu sin theta)/(theta + sin theta)`

D . `(4 mu sin theta)/(2theta + sin2 theta)`

Answer: Option D

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